Instantaneous Cycle-Slip Detection and Repair of GPS Data Based on Doppler Measurement

In GPS receivers, carrier phase measurement can be used to improve the receiver's position accuracy. In order to maintain the accuracy, cycle-slip must be detected and repaired instantaneously and accurately. This paper first analyzes the implementation cycle-slip detection and repair method of GPS data based on Doppler measurement. Then introduce a simplified oscillator model. Based on the oscillator model, a modified method is proposed, which avoids the influence of the local oscillator bias. Data tests show that the root mean square error of the time-difference measurement residual based on the proposed method is small enough for detecting and repairing the cycle-slip instantaneously.